Magnetically Separable Fe3O4/BiOBr Microspheres: Synthesis, Characterization, and Photocatalytic Performance for Removal of Anionic Azo Dye

被引:9
作者
Jiang, Ru [1 ]
Zhu, Hua-Yue [1 ]
Jiang, Shen-Tao [1 ]
Fu, Yong-Qian [1 ]
Zong, En-Min [1 ]
Li, Jian-Bing [2 ]
Zeng, Guang-Ming [3 ]
机构
[1] Taizhou Univ, Dept Environm Engn, 1139 Municipal Govt Ave, Taizhou 318000, Zhejiang, Peoples R China
[2] Univ British Columbia, Environm Engn Program, Prince George, BC, Canada
[3] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha, Hunan, Peoples R China
基金
中国国家自然科学基金;
关键词
BiOBr; congo red; decolorization; Fe3O4; magnetic separation; photocatalysis; BIOBR MICROSPHERES; CONGO RED; SOLVOTHERMAL SYNTHESIS; WATER-TREATMENT; ORGANIC-DYES; DEGRADATION; FABRICATION; ADSORPTION; HETEROSTRUCTURE; DECOLORIZATION;
D O I
10.1089/ees.2018.0278
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Recyclable magnetic Fe3O4/BiOBr microspheres (m-Fe3O4/BiOBr MSs) were synthesized by a simple solvethermal method. The crystals' optical, morphology, and magnetic properties of m-Fe3O4/BiOBr MSs were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive analysis of X-rays, UV-vis diffuse reflectance spectroscopy, Brunauer-Emmett-Teller, and vibrating sample magnetometry techniques. An anionic dye, Congo red (CR), was selected as a model pollutant to evaluate the photocatalytic activity of m-Fe3O4/BiOBr MSs under simulated solar light irradiation. By calculation, the pseudo-first-order rate constant for photocatalytic degradation of CR was 0.0011 and 0.0046 min(-1) using pure BiOBr MSs and m-Fe3O4/BiOBr MSs, respectively. Enhanced photocatalytic activity of m-Fe3O4/BiOBr MSs can result from superior adsorption and transfer performance to organic contaminants in aqueous system. Both the h(+) radicals and O-2(center dot-) radicals were main active species that drive the photocatalytic decolorization of CR solution by m-Fe3O4/BiOBr MSs. Furthermore, the m-Fe3O4/BiOBr MSs can be easily recovered and recycled after the treatment process because of the presence of magnetic Fe3O4. This work suggests that m-Fe3O4/BiOBr MSs may be a promising photocatalyst for photocatalytic treatment of organic wastewater and other environmental remediation.
引用
收藏
页码:466 / 477
页数:12
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